Title: Safety valves for protection against liquid contamination

Abstract: A safety valve which may be used in a pipette or in medical or biological equipment such as collection bottles, employs a carrier which is inserted in a flow line and contains a material which swells in the presence of an unwanted fluid to block the line and provide protection against contamination.

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Inventors: Sharpe, Anthony Nelson (Aylmer, CA, US)

Application Number: 486298
Filing Date: 1974-07-08
Publication_date: 1976-09-28
Assignee: N.V. Internationale Octrooi Maatschappij "Octropa" (Rotterdam, NL)
Primary Class(es): 604/320 73/864.03, 137/197, 422/938
Other Classes:
US Patent Ref:

2348831	May, 1944	Mathis	73/425.
2850033	Sep, 1958	Hartle	137/197.
3285296	Nov, 1966	Ishimaro et al.	141/26.
3719197	Mar, 1973	Pannie, Jr. et al.	128/276.

Other Refs:
Primary Examiner: Michell, Robert W.
Assistant Examiner: Layton, Henry S.
Attorney: Kaufman & Kramer